Supplement

The sun seen from a relativistic spaceship moving at 30% of the speed of
light.
When the spaceship approaches, the sun appears very bright;
at the beginning of the movie it is about three times as bright as for an
observer at rest.
The spaceship passes the sun at a distance of five solar radii
from its center.
During the fly by, the astronaut
first looks towards the front and then turns so that she always keeps
the sun in view.
At the instant, when the vertical bar passes the center of the image,
she looks exactly to the side (i.e. at right angles to the direction
of motion).

The same fly by as above, but the images have been edited to suppress the
change in brightness in favour of the colour change: Each foreground pixel
has been scaled to the same predefined level of brightness.

The sun seen from a relativistic spaceship moving at 90% of the speed of
light.
The images are adapted in brightness as in the preceding movie.
Here, the variation in brightness is too large to be displayed on a monitor:
In the first image the sun would have to be 30 million times as bright
as in the last.

Snapshot of the sun seen from a spaceship moving at 99,9% of the speed of
light and close to the sun: the sun appears multicolored.
The image was adapted in brightness as in movies 2 and 3.
Here, the path of the spaceship
approaches the sun up to a distance of three solar radii from its center.
The sun is close by and subtends a large solid angle, therefore the
Doppler shift varies appreciably across the image.
The snapshot was taken at just the right moment to make the colours
range from blue to orange.
To suppress the brightness variation and clearly show the colour change,
each foreground pixel has been scaled to the same predefined level of
brightness.